这个词是什么意思？
A subtype of INFLUENZA A VIRUS comprised of the surface proteins hemagglutinin (VIRAL HEMAGGLUTININ) 1 and neuraminidase (NA PROTEIN, INFLUENZA A VIRUS) 2. It is endemic in both human and pig populations.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D057221 · MeSH 2026。
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